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Updated: Apr 11, 2026

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Dopaminergic reciprocal circuits for learning and memory.

M C Kiren1, U G Bozok2, M I Alp3

  • 1Department of Physiology, Graduate Education, Istanbul Medeniyet University, Istanbul, Turkiye; Department of Physiology, School of Medicine, Ankara Medipol University, Ankara, Turkiye.

Neurobiology of Disease
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

Dopamine signals from the ventral tegmental area (VTA) influence learning and memory. Their effects depend on the target brain circuit and the specific learning phase, offering a new framework for understanding cognitive disorders.

Keywords:
Cognitive impairmentDopamineFear extinctionNeural circuitsNeuropsychiatric disordersOptogeneticsPathophysiology dopamineTranslational neuroscienceVentral tegmental area

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neurobiology

Background:

  • Dopaminergic (DA) projections from the ventral tegmental area (VTA) are crucial for learning and memory (L&M).
  • Dysfunction in these pathways is linked to neuropsychiatric disorders.
  • The precise mechanisms by which VTA DA projections yield diverse behavioral outcomes are not fully understood.

Purpose of the Study:

  • To synthesize optogenetic and chemogenetic findings on VTA DA projections to the prefrontal cortex (PFC), hippocampus (HPF), and basolateral amygdala (BLA).
  • To examine the roles of these projections across different L&M phases.
  • To propose a unifying framework reconciling conflicting data on DA's role in L&M.

Main Methods:

  • Systematic review and synthesis of optogenetic and chemogenetic studies.
  • Analysis of VTA DA projections to PFC, HPF, and BLA.
  • Examination of L&M phases, including fear learning and extinction.

Main Results:

  • Comparable DA activity patterns can produce opposing behavioral effects based on target circuit and L&M phase.
  • A "phase-by-target" framework is proposed where DA acts as a phase-specific instructional signal.
  • DA facilitates contextual encoding (HPF), inhibitory control (PFC), and associative updating (BLA).

Conclusions:

  • The "phase-by-target" framework reconciles conflicting findings on DA's role in L&M.
  • Pathological states may result from mismatches in DA signaling, learning phase, and circuit engagement.
  • This circuit-level understanding identifies potential therapeutic targets for neuropsychiatric disorders.